Malicious PDF — malware analysis report

Static analysis result for SHA-256 10946a540ca53734…

MALICIOUS

PDF

77.3 KB Created: 2021-03-27 18:49:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 99f9658d1112fefda21cb4034a061508 SHA-1: 23e1c37f67e684008fc41993eddb140489de97fe SHA-256: 10946a540ca537342e3895d0e142b2465597597e8801f711afc3b98b52bd17ae
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains numerous external links, with one heuristic specifically identifying a 'Payment redirection / bank-detail change lure'. The presence of a link to 'zajinet.ru' and a large number of embedded PDF links suggests an attempt to redirect users to malicious sites. ClamAV also detected this file as 'Pdf.Phishing.Trojan'. The ML classifier output of 0.999778 further supports the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://zajinet.ru/strik?utm_term=burger+king+app+offers+drive+thru
    • https://magudutetu.weebly.com/uploads/1/3/1/4/131437318/7913943.pdf
    • https://static.s123-cdn-static.com/uploads/4485172/normal_5fd032cb829fd.pdf
    • https://nulabelavomeviz.weebly.com/uploads/1/3/1/4/131413951/pekokosarebilopugu.pdf
    • https://cdn-cms.f-static.net/uploads/4504641/normal_6029e568e6aad.pdf
    • https://static.s123-cdn-static.com/uploads/4377656/normal_5fc6dd1608031.pdf
    • https://static.s123-cdn-static.com/uploads/4495536/normal_5ff5f9b4351a8.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://83d12552-0bc1-4415-b221-1da25caacb9b.filesusr.com/ugd/1e11d0_2370a617934843bd910fdd58f60a3fd8.pdf?index=true
    • https://ac685e6e-6442-44c0-91a1-b3a367e79ef2.filesusr.com/ugd/ce77c6_4689aa914daf4bb088ef64c3e8b30631.pdf?index=true
    • https://s3.amazonaws.com/xazarujokemus/street_fighter_apk_obb.pdf
    • https://a79c6309-487e-499f-a993-0ac454a400c8.filesusr.com/ugd/747acf_5a20da6e555d4ef6a968b32184404243.pdf?index=true
    • https://s3.amazonaws.com/pusolefosex/senali.pdf
    • https://s3.amazonaws.com/jivuxo/dopizogu.pdf
    • https://s3.amazonaws.com/jemisajoda/is_liberty_mentioned_in_the_constitution.pdf
    • https://s3.amazonaws.com/mozirolinitaje/foam_sheet_craft_basket.pdf
    • https://71f68c9c-1037-483c-a0ca-f268b7ddd3c8.filesusr.com/ugd/87fdc7_f6886ece675143658fbd64dac7ce3582.pdf?index=true
    • https://4b523d79-2bc6-404f-8e52-0acae4d2cb03.filesusr.com/ugd/fe1b41_f5521d5a9d734a309dd50f1b9cd3b165.pdf?index=true
    • https://ebd73b9a-b255-48a5-b781-2bd84b483b4c.filesusr.com/ugd/956c05_e4ad9f70515f4540af154ccf352581e3.pdf?index=true
    • https://95fbbc11-640f-4658-acdf-6e09da746871.filesusr.com/ugd/e42ee3_c8fcca193abb47e196d09197ac4d431b.pdf?index=true
    • https://dcc20dec-0195-4543-b617-cfb82efd15f0.filesusr.com/ugd/30ea26_10a74de09f114f8bab7800212a331fdd.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee99.bin
f3d0cfcdd4192f60a58dd37819116ef2a33188d11325ae7995ea99bedbe2c14d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE99 5444 bytes
font_01_sfnt_off0001012b.bin
84565801d1ab9d0594931fee3f2375526622c96ddc4bca41f26124bf33f0696e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1012B 11444 bytes

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